BP said on Monday that a pipeline at its 30,000 barrel-per-day Lisburne, Alaska field, which is currently closed for maintenance, ruptured during testing and spilled a mixture of methanol and oily water onto the tundra, according to a report by Reuters.

The Alaska Department of Environmental Conservation said the spill occurred on Saturday and amounted to 2,100 to 4,200 gallons, affecting 4,960 square feet of gravel pad and about 2,040 square feet of wet and aquatic tundra, Reuters reports.

Immediate efforts are focused on containment and cleanup, said Tom DeRuyter, state on-scene coordinator for the Department of Environmental Conservation, as quoted in the Reuters report. Cleanup must be completed before the pipe section is excavated, he added.

The pipeline will also have to be dug up to allow for an investigation into why it failed, DeRuyter said.

To read the full Reuters report on this story, click here.